OTA support in JN-AN-1220

in section 5.7.2.1 "Using Makefiles" mentioned to add "OTA=1 to build with OTA client". But the whole project contains no OTA related files and very few words of OTA. Only one line "#APP_CLUSTERS_OTA_SRC ?=1" can be found in each makefile under directory build.

Please check if this JN-AN-1220 v1002 release really contains OTA support or not? Looks to me is NOT.